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Set.prototype.clear() - JavaScript | MDN
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Set.prototype.clear()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The clear() method of Set instances removes all elements from this set.
Try it
const set = new Set();
set.add(1);
set.add("foo");
console.log(set.size);
// Expected output: 2
set.clear();
console.log(set.size);
// Expected output: 0
Syntax
js
clear()
Parameters
None.
Return value
None (undefined).
Examples
Using the clear() method
js
const mySet = new Set();
mySet.add(1);
mySet.add("foo");
console.log(mySet.size); // 2
console.log(mySet.has("foo")); // true
mySet.clear();
console.log(mySet.size); // 0
console.log(mySet.has("foo")); // false
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-set.prototype.clear |
Browser compatibility
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